The Korean National Police Heritage Museum, Seoul
The second floor (you go from the fifth floor down during your visit) has several experiences - lie detectors, fingerprinting, traffic control, and a simulation shooting range, among other things. Again, exhibits are all in Korean, so some of them are difficult to use without being able to read and understand the language.
For most visitors, this museum is probably pretty low on the list. It's located near the Seoul Museum of History, the agricultural museum, Seoul Museum of Art, and Deoksugung Palace, though, so it was on my day's sightseeing route.
The museum has a very good English website. It (the museum, not the website) is open 9:30-17:30. Admission is free.
From Line 5's Seodaemun Station, take Exit 4 and follow the main road for about seven minutes; look for the building facade in the first picture. Note that the agricultural museum and Seoul Museum of History are both on this street as well. In order, from Seodaemun Station, you'll pass the agricultural museum, then the police museum, and soon after that you'll reach the history museum.